Cot assembling apparatus



1954 K. P..swANsoN ETAL 2,691,402

COT ASSEMBLING APPARATUS 2- shuu-shu'z 1 Filed Dec. 18, 1951 K. P.SWANSION ET AL Oct. 12, 1954 7 2,691,402

co'r ASSEMBLING APPARATUS 2 Shoots-Shut 2 Filed Dec. 1a, 1951 3 WV////W//////// A m z mm V ll W Patented Oct. 12, 1954 UNITED STATES PATENTOFFICE COT ASSEMBLIN G APPARATUS Kenneth P. Swanson, Abington, andRichard K. Butler, Whitman, Mass., assignors to Louis M. Gotchett,Whitman, Mass.

Application December 18, 1951, Serial No. 262,304

1 Claim. 1

This invention relates to an improved method and apparatus for applyingcots to the shell portions of antifriction top rolls of the typeutilized in textile drawing machines.

In providing a cot body which can be tightly secured about thecylindrical shell of an antifriction top roll, it is customary, in atleast one well known type of cot, to form the inner opening or bore ofthe cot with a diameter smaller than the outer diameter of the shell,and to expand the cot body as it is forced on over the shell. A coatingof adhesive on the inner bore of the cot is moistened at the time ofinstallation and this coating, when dry, further aids in securing thecot to the shell.

It has been found that the forces required to expand and press the coton'over the shell are of considerable magnitude, and if these forces areallowed to bear against the top roll spindle or the bearing race, theremay occur a deformation of the race member. Such deformation is commonlyreferred to as brinelling, and the operating characteristics of the toproll bearings are seriously impaired thereby. Definite objections arepresent to avoiding the difficulty by removing the inner working partsof the top roll from the shell. Dificulty is further experienced fromthe fact that in forcing the shell into contact with the moistenedadhesive coating on the inner opening of the cot, portions of the moistadhesive may be scraped away from the cot bore and become transferred tothe inner working parts of the top roll member, with clogging and otherundesirable conditions being developed.

The present invention is concerned with the problems indicated inconnection with installing cots and aims to devise a method andapparatus for applying cots, whereby any deformation of the ball bearingrace is substantially eliminated and any tendency for adhesive to becometransferred into the inner working parts of the top roll member isavoided. It is also an object of the invention to devise a simple,economical and efiicient cot applying attachment which can readily besecured to various types of cot assembling machines, thus making use ofthe reciprocating ram element customarily found in such devices.

These and other objects and novel features will be more fully understoodand appreciated from the following description of a preferred embodimentof the invention selected for purposes of illustration and shown in theaccompanying drawings, in which:

Fig. 1 is a fragmentary side elevational view showing parts of a cotassembling machine with the cot-applying attachment of the inventionillustrated in an operative position;

Fig. 2 is a front elevational view illustrating the cot-applying deviceon a smaller scale.

Fig. 3 is an exploded view showing parts of the shell and ball bearingrace support common to a top roll;

Fig. 4 is a view in elevation and partial crosssection illustrating aguide member forming part i. of the apparatus of the invention;

Fig. 5 is a side elevational view illustrating a top roll of the typeincluding two cot members such as are installed with the aid of thecotapplying device of the invention;

Fig. 6 is a plan cross-section taken on the line 66 of Fig. 1;

Fig. 7 is a detail elevational view of a top roller shell shown engagedwith a guide member of the invention, also indicated in cross-section;

Fig. 8 is a cross-section taken on the line 8-8 of Fig. 6, illustratingone position assumed by the apparatus of the invention in which a cotmember has been partly started over the end of a top r011 shell;

Fig. 9 is another view in elevation and partial cross-section showingthe cot-applying apparatus in another position in which the cot memberis fully installed on the top roll shell; and

Fig. 10 is a cross-section taken on the line |0I0 of Fig. 8.

With the above noted problems in mind we have devised an improved methodof applying cots based on the novel concept of pressing a top roll shellinto the cot body with the shell supported in a selective manner suchthat none of the forces involved are imposed on the bearing componentsof the top roll. At the same time the method of handling the shell is socarried out that a desirable sealing action is realized, effectuallypreventing any transfer of adhesive from the inner surface of the cot tothe bearing components. The apparatus illustrated in the figures abovereferred to constitutes one desirable means for carrying out theseoperations.

Preferably our improved method is carried out, making use of certainparts of conventional cot assembling mechanism for exerting pressure.Therefore, a portion of one standard type of cot assembling machine hasbeen indicated in the drawings as an aid to more fully understanding theinvention. It should be understood, however, that the invention is notlimited to this or any other particular cot assembling mechanism.

Thus, in Fig. 1 we have shown fragmentarily an upright portion In of astandard cot assembling machine which carries an adjutsable cot holderbase 12 adapted to detachably hold therein a cot body 14 in an uprightposition suitable for receiving the shell portion of a top roll Rtherein, as has been indicated in the drawings. The upper section of theupright portion In is formed with a transversely extending arm l6 havinga vertically formed bore through which is slidably received a ram H3.The latter member is raised and lowered by manual operation of a handlel9 through some suitable mechanism such, for example, as a rack andchain, commonly employed, in devices of this class. It will be observedthat the ram is in axial alinement with the cot body l4 when the latteris supported in the cot holder l2, as described above.

In accordance with one preferred embodiment of our invention, we providefor use with this pressure exerting mechanism a cot applyingapparatuswhich includes driving means in the form of a pressure bracket member,generally denoted by the arrow 29, and a separate cot guide elementconsisting of a tapered nose piece 22.

This tapered nose piece 22 has been shown in Fig. l with a lower taperedend inserted in the cot body M in readiness to start a cot applyingoperation. As will be apparent from an inspection of Fig. 4, the nosepiece generally comprises a cylindrical sleeve open at one end andformed at its opposite end with a solid tapered head. An importantfeature in the construction of the nose piece is that the open end isformed with an inner shoulder 22a and a sealing rim 22b. The shoulderand sealing rim portions are carefully chosen of a size such that oneend of the top roll shell 36, Fig. 1, may be slidably received in thesealing rim and solidly supported against the shoulder 22a, insubstantially sealing relationship, as has been better shown in Fig. '7,thereby precluding any transfer of adhesive into the bearing components.

Cooperating with the nose piece 22 is the pressure bracket member of theinvention, which member, as shown in Figs. 1 and 2, is formed with anelongated reinforced body portion 24. At the upper end of this bodyportion is provided an offset holder section 26 carrying a threaded post28 which is adapted to be threaded into the lower end of the ram l8 sothat the pressure bracket member may be raised and lowered with movementof the ram member.

At its opposite lower end the pressure bracket 20 is formed with apresser element 30 which extends transversely outwardly from. the bodyportion 24 and presents a bifurcated end defining flat bottom drivingsurfaces 32 and 34 which are spaced apart from one another. When thepressure bracket is threaded into the ram, and the latter is in a raisedposition, the bifurcated. end is located a sufiicient distance below theupper holder section 26 to receive the upper end of the top roll memberR. in the position shown in Fig. 1. It is also pointed out that theopening between the bifurcated end 30 and the holder section has beenchosen sufficiently great to provide space through which the upperspindle end R of the top roll member may-move without interference whenthe bracket is depressed in response to movement of the ram l8.

As shown in Fig. 1, it will be observed that the top roll R. has beenindicated with one cot, not installed, so as to leave-exposed the shell36 already referred to above In Fig. 3 the inner bearing componentsnormally supported in this top roll shell 36 have been shown partiallyremovedfrom 4 the shell and, as will be apparent from an inspection ofFig. 3, include the spindle R, a ball bearing race support 38 on thespindle, and a ball bearing race 40 adapted to be rotatably mounted onthe race support.

Attention is directed to the fact that the outer end of the race support38 tapers inwardly away from the inner peripheral surface of the shell36 and thus forms a narrow annular space which separates the shell andball bearing race support from one another, as has been more clearlyshown in Figs. 6 and 8.

An important feature of the invention is the provision of the drivingsurfaces 32 and 34 on the bifurcated end of the holder, with thesesurfaces being spaced apart a distance so chosen that the two surfacesin the position illustrated in Figs. 1, 6, 8 and 9, can bear on the topedge of the shell member 36 without coming into contact with the racesupport 38, as will be particularly evident from an inspection of thebroken-away portion of Fig. 8. Such an arrangement provides forselective transmission of forces exerted from the ram [8 through thepressure bracket against the top roll shell without, in any way,imposing forces on the ball bearing race or its supporting member.Similarly, the opposite end of the shell is selectively engaged againstthe shoulder 22a without the lower race support 38 being contacted. Inthis way the shell throughout its length is selectively held and canthen be driven or forced into the cot l4 without danger of impairing thebearing components.

The apparatus described may be employed either in assembling a new cotor in replacing a worn cot body with a fresh unit. It should be notedthat the cot-applying means is especially desirable from a replacementstandpoint since a worn cot element may be readily cut away from itssupporting shell and a new unit installed without requiring any removalor adjustment of the bearing components of .the top roll.

Considering one typical cot-applying operation, a cot member to beinstalled is first mounted in the holder 12 so as to assume a positionsuch as that shown in Fig. l. Thereafter the nose piece 22 is engaged inthe upper exposed end of the cot M with the tapered head of the nosepiece being pressed into the cot as far as it will go with a lightpressure, as noted in Fig. 1. Thereupon the shell portion of a toproller unit, such as has been illustrated in the drawings, is fittedinto the upper end of the nose piece in the sealed relationship alreadydescribed so that the thin flanged rim 22b of the nose piece overlapsand snugly fits against the lower peripheral edge of the shell 36. Inthus mounting the top roll unit upon the nose piece, the spacer sectiond2 of the top roll is passed between the bifurcated end of the pressurebracket 20, in the manner illustrated in Figs. 1 and 6, so that the flatdriving surfaces 32 and 34 occur slightly above the top edge of theshell 36.

The handle I9 is then depressed, forcing the ram l8 and the pressurebracket 20 downwardly until the driving surfaces 32 and 34 engageagainst the top edge of the shell 36 in substantially the position shownin Fig. 8 of the drawings. Further downward movement of the ram is thencauses the shell and nosepiece assembly to be forced downwardly throughthe cot M during which period the nose piece 22 acts to spread andenlarge the cot body and thereby allows the shell 36 to readily passintothe cot opening. The downward movement is continued until the bottomedge of the shell 36 has reached a position substantially flush with thebottom edge of the cot l 4, as has been suggested in Fig. 9. At thispoint the nose piece has passed through the cot l4 and falls through anaperture in the cot holder l2, also as indicated at the lower side ofFig. 9.

In addition to the important operation of selectively holding the shellat its two opposite ends so that no pressure is exerted on the bearingcomponents, there also occurs the very desirable sealing action whichhas been referred to at an early point in the specification, thissealing action being achieved by the overlapping arrangement of the nosepiece rim 22?) with respect to the forward or lower end of the shell 36.It will be apparent that such an arrangement as that described precludesany likelihood of moistened adhesive material, occurring on the innerperipheral surface of the cot, being scraped away from the cot andtransferred into the bearing components contained inside of the shellmember.

It will be seen that we have provided a novel, simple, and efficientmethod and means for assembling cots on top roll shells, and that thebearing components of the top roll can be protected and shielded againstpressure effects or entrance of foreign material in any way.

While we have shown a preferred embodiment of the invention, it shouldbe understood that various changes and modifications may be resorted toin keeping with the spirit Of the invention as defined by the appendedclaim.

We claim:

A device for inserting a tubular shell containing a bearing assembly ateach inner end portion in an expansible hollow roll having a coating onits inner face, said device including a nose piece having one endtapered to form a guide for entering said expansible hollow roll, thebody of said nose piece being of cylindrical form and of greaterdiameter than the unexpanded bore in said expansible hollow roll, theother end of said nose piece being formed with a countersunk innerannular shoulder for receiving and supporting an end of said shell, saidshoulder being defined in part by an annularwall having such a diameteras to snugly enclose and seal the outer face of said shell adjacent itsends, whereby said shell during its movement into said expansible hollowroll is spaced from the inner coated wall of said roll and the coatingmaterial is sealed from passage into contact with the bearing assemblieswithin the shell.

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